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Hello,, your problem is likly due to faulty contacts on the mechanical switches in your unit, you must dissemble the unit to the point of being able to access the switches main body,(electrical contacts) and spray cleaner solutions on the contacts, this will clean the contact surfaces and restore normal operation of your device, the contact switches are likely Aux input, tape monitor any equalizer switches. a contact cleaner spray from the any electronic supply will work well and a finite use of WD 40 is also very good, but use it sparingly. Good luck

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it sounds like the cone in the centre has blown. Use a 'spare speaker' not one from the system and try it, is should work, but if it was the centre speaker cable that shorted, should you get no sound from the spare it sounds like you have blown that part of the system which will require professional repair. Sorry

Don't know about the type of your hardware, but your description is very light. In order to further isolate the problem, I would do the following:

1. Replace the speaker with a working one. If this works fine, then it is really the speaker that is broken. If however the intact speaker shows the same problem when connected to the same channel, then the amplifier/equalizer has an issue.

If it is by this confirmed that the speaker is broken look at step 2:

2. Inside the speaker there is usually a frequency separation filter. Either the bass loudspeaker is damaged or the filter. Ideally you could exchange filter and loudspeaker with parts from a working speaker box and find out by this which component is defective.

3. Once you have identified the defective component, try to find out the brand and type and perform an internet search.

4. If you don't find anything, bring the whole thing to a repair service, they can order the spare part.

If you are too lazy or technically not very skilled, go directly to step 4.